Having an infection raises your body temperature

Also the toxin damage taken during INFECTION_LEVEL_ONE is greatly
reduced.
Fixes robotic internal organs getting infections.
Fixes the organ_failure random event. Forgot to set the affected organ
as needing processing.

(cherry picked from commit 1a57ed735531f91c5b3707e98b0e49b71769e19b)
Fixed misplaced prob(), added notes

(cherry picked from commit 5305de5ecb2d17bc4bb770fe3f2805827eec86ba)

Conflicts:
	code/setup.dm